Abstract: The mean-field theory was used to analyze the experimental data and calculate the magnetic characteristics of GdFeCo films.The temperature dependence of saturation magnetization,macroscopic exchange stiffness and the magnetic anisotropy energy were caculated.Also,the effect of composition on the compensation temperature and the curie temperature of GdFeCo films was analyzed in detail.The results will give theoretical directions to the use of the GdFeCo film in new magneto-optical recording techniques.